Statistically optimized adsorption of Pb(II) ion on Corn Husk activated carbon – An application of Response Surface Method

Authors : Agha Arslan WASİM, Muhammad NASIRUDDIN KHAN, Saba FAZALURREHAMAN

Pages : 421-432

Doi:10.35378/gujs.796618

View : 16 | Download : 6

Publication Date : 2022-06-01

Article Type : Research Paper

Abstract :In this study, the Response Surface Method statistically optimized Pbinsert ignore into journalissuearticles values(II); adsorption on activated carbon prepared using corn husk. The full central composite design was the statistical method selected for optimization using adsorption capacity as a response factor. The quadratic model best explained the process. Adsorption parameters optimized were solution pH, contact time, temperature, and adsorbent dose. The respective optimum values were 4.5, 64 min, 50°C, and 0.4 g L-1. Adsorption isotherm and kinetics studies evaluated the data obtained at different temperatures using different isotherm and kinetics models. The non-linear curve fitting method determined the model with the best fit. Freundlich’s model best accommodated the isotherm data, whereas the pseudo-second-order kinetic model best modeled the kinetics data. Weber-Morris intraparticle diffusion model revealed the existence of multiple rate-controlling processes. The activation energy for the adsorption of Pbinsert ignore into journalissuearticles values(II); ions was 30.17 kJ mol-1. The thermodynamics studies showed that the process was an entropy-driven endothermic process. Gibb’s free energy insert ignore into journalissuearticles values(ΔG); values were negative at the studied temperatures, and the spontaneity increased with the increase in temperature. The enthalpy insert ignore into journalissuearticles values(ΔH); and entropy change insert ignore into journalissuearticles values(ΔS); was 43.78 kJ mol-1 and 154.2 J mol K-1. The study concluded that the statistical method simplified the optimization of the adsorption process and produced an efficient adsorbent from corn husk.
Keywords : Adsorption, Corn Husk, Activation optimization, Response Surface Method, Adsorption Isotherm, Adsorption Kinetics